GCSE > Computer Science > OCR > GCSE Computer Science > ALGORITHMS AND PROGRAMMING: Algorithm representation > Nesting in algorithms
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COMPUTER SYSTEMS: Encoding and compression

COMPUTER SYSTEMS: Network topologies

COMPUTER SYSTEMS: Wired and wireless networks, protocols, and layers

COMPUTER SYSTEMS: Threats to computer systems and networks

COMPUTER SYSTEMS: Operating systems and utility software

ALGORITHMS AND PROGRAMMING: Types of data

ALGORITHMS AND PROGRAMMING: Producing robust programs

ALGORITHMS AND PROGRAMMING: Designing, creating, and refining algorithms

ALGORITHMS AND PROGRAMMING: Artificial Intelligence (AI)

  • Nesting refers to putting one control structure inside another for more complex algorithms with multiple layers of decision-making or repetition.
  Method Use case Example
Nested selection One selection statement is placed inside another. The inner condition is only checked if the outer condition is met. Tests multiple related conditions, checks input in steps (e.g. username correct, then password correct)

IF x > 0

THEN IF x < 10

THEN ...
Nested iteration One loop runs inside another. The inner loop completes for each cycle of the outer loop Comparing arrays and performing large repetitions

FOR i = 1

TO 5: WHILE

condition ...

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